A rubber balloon has become negatively charged, and the charge is measured as 1.00 * 10^-14C according to the this charge, the balloon has an excess of how many electrons?

Charge on balloon = \(- 10^{-14}C\)
Thus, as it is negatively charged, we know that it has an excess of electrons.
1 electron charge = \(-1.6 * 10^{-19} C\)
Thus if one electron has \(-1.6 * 10^{-19} C\) charge.
Then let x electrons have \(- 10^{-14}C\) charge.
Therefore, more electrons means more charge thus they have a direct relation.
Thus,\[\frac{x}{1} = \frac{- 10^{-14}C}{-1.6 * 10^{-19} C}\]
\[x = 62500\]
And therefore we can conclude, that the number of extra electrons on the ballon = 62500\(e\)
Understood? :)